8251440 has 40 divisors (see below), whose sum is σ = 25580208. Its totient is φ = 2200320.

The previous prime is 8251429. The next prime is 8251483. The reversal of 8251440 is 441528.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 8251440.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16951 + ... + 17430.

Almost surely, 2^8251440 is an apocalyptic number.

8251440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8251440 is an abundant number, since it is smaller than the sum of its proper divisors (17328768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8251440 is a wasteful number, since it uses less digits than its factorization.

8251440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34397 (or 34391 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 8251440 is about 2872.5319841561. The cubic root of 8251440 is about 202.0737566818.

Adding to 8251440 its reverse (441528), we get a palindrome (8692968).

The spelling of 8251440 in words is "eight million, two hundred fifty-one thousand, four hundred forty".